FiniteStack.java |
1 /** 2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved. 3 * 4 * 5 * 6 * 7 * The contents of this file are subject to the terms of the Liferay Enterprise 8 * Subscription License ("License"). You may not use this file except in 9 * compliance with the License. You can obtain a copy of the License by 10 * contacting Liferay, Inc. See the License for the specific language governing 11 * permissions and limitations under the License, including but not limited to 12 * distribution rights of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 * SOFTWARE. 21 */ 22 23 package com.liferay.util; 24 25 import java.util.Stack; 26 27 /** 28 * <a href="FiniteStack.java.html"><b><i>View Source</i></b></a> 29 * 30 * @author Brian Wing Shun Chan 31 */ 32 public class FiniteStack<E> extends Stack<E> { 33 34 public FiniteStack(int maxSize) { 35 super(); 36 37 _maxSize = maxSize; 38 } 39 40 public E push(E item) { 41 super.push(item); 42 43 int size = size(); 44 45 if (size > _maxSize) { 46 removeElementAt(size - 1); 47 } 48 49 return item; 50 } 51 52 private int _maxSize; 53 54 }